Someone likes their particle effects. Each level is just more of the same. if you sit just off center all the enemies spawn withing a 30 degree arc from you.
Maybe make it so if you enter a wrong icon you have to start over? or go back one icon? and change the color of the entered icons? cause with how it is now you can just up then click really fast and run through the code in a second or two.
got to 7, its irritating that they will get to the exit and turn around, go all the way back up to the previous level and then come back down. im gonna go play some dungeon keeper 2.